Stoker-driving mechanism



Patented oct. 13. 1925.`

UNITED STATES 1,557,091 PATENT oFFicE.

ROBERT SANFORD RILEY, OF WORCESTER, MASSACHUSETTS,ASSIGNOR T SANFORD RILEY STOKER COMPANY, 0F WORCESTER, MASSACHUSETTB,` A.' CORPORATION OF MASSACHUSETTS.

STOKER-DRIVING MECHANISM.

Application led April 22, 1922. Serial No. 556,013.

proved arrangement and disposition ofV driving mechanism`for the different parts thereof. Such stokers necessarily include mechanically actuated fuel feeding means 15 and provision for supplying air under pressure.

It is the object of my invention to provide a construction and assembly of these necessary parts, particularly adapted for a 20 single unit stoker, and in Which both the fuel feeding mechanism and the air supplying means maybe conveniently driven from a single source of power.

More specifically, in the preferred form u provide a turbine or other prime mover to drive a fan for supplying the, air under pressure and I provide a speed reducing connection between the turbine and the fuel feeding mechanism through which the latter 30 lmay be driven at a reduced speed.

A further featureof my invention relates to the provision of an air opening and fan in the front wall of the furnace adjacent the fuel feeding mechanism and conveniently VN positioned for a combination drive therewith. I

My invention further relates to arrangements and combinations of parts which will be hereinafter described and more particu- 0 larlv pointed out in the appended claim.

One form of my invention is shown in the drawings, in which- Fig. 1 is a front elevation, partially diagrammatic, of an underfeed stoker embody- 45 .ing my improvement:

Fig. 2 is a longitudinal sectional elevation thereof, partially diagrammatic, taken along thev line 2-2 in Figs. 1 and 3and Fig. 3 is a transverse sectional elevation,

w taken along the line 3-3 in Fig. 2.

Referring to the drawings, I have shown for illustration a stoker of the side retort type, comprising a hopper and a fuel feeding plunger Q1' ram 11 by which fuel is'.

forced through a casing or chute 12 in the front wall 13. The fuel is received in a `side retort 14 from which it is transversely advanced by overfeed grates 15 to dumping plates 16 adjacent the 'side wall 17.v v

The coal vfeeding ram or plunger 11 is actuated by a crank shaft 18 connected by suitable gearing with a driving shaft 19. The parts thus far described are shown for illustration only, and in themselves form no part of my present' invention. For a more complete description of the construction and operation thereof and particularly lof the connections between the shaftv 19 and the crank shaft 18, reference is made to my copending application Serial No. 556,012, filed April 22, 1922. i

An air chamber 20 is formed beneath the retort 14 and a casing or sleeve 21 extends through the front wall 13 and provides for admission of air thereto. The air from the chamber 2O is conducted to the several parts of the Stoker as may be required.

In the form shown in the drawings, a portion of the air is delivered through tuyre openings 22 in the side wall 23 of the retort, the air pressure for these openings being controlled by a damper 24. Additional air is supplied through tuyre openings 25 in the opposite wall of the retort and a second air chamber 26 receives air from the chamber 20 for the overfeed grates 15, the presnections by which the proper ratio of movements is maintained. Any* other suitable speed-reducing connections may be substi-` tuted for that herein shown.

The driving mechanism for the Stoker is thus disposedvwithin a very limited space at the front of the Stoker where it is conveniently accessible for inspection 0r repair and sure of this air being controlled by a damper los a single actuator only isrequired to operate the entire stoker and to supply the necessary air under pressure therefor.

' tion, a front wall with air and fuel openings therein, a retort extending rearward from the front wall of said Stoker, a ram to feed coal through the fuel opening in said wall to said retort, a crank shaft, connections bctween said crank shaft and said ram for driving the ram, a motor mounted forward of the air opening in the wall, a shaft Vfor said motor, the rear end of said shaft eX- tending into said air opening, a fan driven by said motor, mounted on said end of the shaft, in said opening, the motorshaft also extending forwardly of the motor, a speed reducing connection between said forwardly' extending motor shaft and said crank shaft, said connections including a worm and worm wheel and providing a slow powerful feeding movement of the crank shaft and ram.

In testimony whereof I have hereunto affixed lny signature. v

ROBERT SANFORD RILEY. 

